Docklands Light Railway staff have voted to go on strike in a continuing row over pay and conditions.

As the prospect of the first national strike looms and against a backdrop of more anti-strike measures, members of the Rail, Maritime and Transport union backed industrial action by four to one in their dispute with operators Keolis/Amey Docklands.

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The union’s executive will now consider the result and no dates have been set for any action.

The RMT said it had been involved in extensive talks with the light rail operators over a range of issues including a pay review and payment dates.

RMT general secretary Mick Cash said: “The union had no option but to move to a ballot of both the directly employed DLR staff and those hired in through [contractors] Interserve in these two separate disputes.

“The union will not sit back while core issues on pay and working conditions are left unresolved. The ballot results have delivered a huge democratic mandate that the political class could only dream of.

“Our reps were in no doubt that we needed to send a clear message to management that staff are prepared to fight to demand decent rewards and recognition, a safe working environment, decent working conditions and will not be forced into accepting inferior pay arrangements from either KAD or their approved contractors . Our members have now sent that message loud and clear.

“RMT’S executive will now consider our next moves and the union remains available for talks in both disputes.”

Keolis/Amey Docklands MD Kevin Thomas, said: “I’m very disappointed to see that 54% of our RMT members have voted for strike action on the DLR despite the latest pay offer reflecting what RMT requested and the fact that we have further talks planned.

“We will continue to do all we can to resolve this issue and to avoid unnecessary disruption for our passengers.”